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thanks again oilman,have read document 101,i will contact installers today hayden

thanks for the information,very helpful. could you please explain what interlocking the boiler means to me before i contact the installers hayden

i had a new heating system fitted 7 months ago, and now i have got three problems with it, the first is the boiler keeps switching on and off,up to 20 times in one hour,until water up to temperature, there is a sound of rushing water in the pipes going to the boiler (sounds like toilet flushing)...